Cylinder cleaning rack



March 1959 w. B. RYNDERS CYLINDER CLEANING BACK 2 Sheets-Sheet 1 FiledApril 1, 1957 N 02 am 55.

INVENTOR. W. B. RY NDE RS 341% W A TT'OR/VEVS March 24, 1959 w. B.RYNDERS CYLINDER CLEANING RACK 2 Sheets-Sheet 2 Filed April 1, 1957 IFIG. 3

INVENTOR. w.s. RYNDERS BYWA W A T TORNEYS United tates tent CYLINDERCLEANING RACK Wesley B. Rynders, Burger, Tex., assignor to PhillipsPetroleum Company, a corporation of Delaware Application April 1, 1957,Serial No. 649,757

10 Claims. (Cl. 15-304) This invention relates to apparatus for cleaningliquid petroleum products from chemical storage and shipping cylinders.In one aspect it relates to apparatus for cleaning such cylinders, whichapparatus is intended to minimize manual labor involved in the cleaningoperation.

Cleaning of barrels, drums, and cylinders and like containers ordinarilyinvolves considerable manual labor. Many devices have been conceived forreducing the manual effort in such operations. To my knowledge none haveproven entirely acceptable for handling metal cylinders such as thoseused in transportation and storage of chemicals and liquid petroleumproducts. Cylinders for storing and/or for shipping liquefied normallygaseous products usually are made of heavy-walled metal stock so thatduring use the cylinders will not be dented or seriously damaged.Heavy-walled metal cylinders, that is, those of appreciable size, areheavy and an apparatus designed to relieve an operator of need forlifting such cylinders is highly desirable.

An object of this invention is to devise an apparatus for cleaning,storage and shipping cylinders.

Another object of this invention is to devise an apparatus for cleaningsuch cylinders which eliminates much manual labor.

Still another object of this invention is to devise apparatus for suchuse which is rugged, easily operable and relatively inexpensive toconstruct and to maintain.

Other objects and advantages will be realized upon reading the followingdisclosure which, taken with the attached drawing, forms a part of thisspecification.

In the drawing Figure 1 is a plan view partly in section, of aninstallation of my cylinder cleaning apparatus and taken along the line1--1 of Figure 2.

Figure 2 is an elevational view, partly in section of such aninstallation.

Figure 3 is an elevational view, partly in section and on an enlargedscale of one cylinder handling unit of my invention.

Figure 4 is an elevational view of a portion of the apparatus of myinvention.

Figure 5 is a perspective view of a portion of the apparatus of Figure4.

According to my invention I have devised a storage cylinder cleaningrack assembly comprising, in combination, a rigidly supported hollowupright post, a slide movable axially in said post, a pair of oppositelydisposed slots in said post, the long axes of said slots being disposedaxially with respect to said post, an opening through said slide normalto the axis of said post, a clamp assembly for holding a storagecylinder, one end of said clamp assembly extending through said slotsand said opening, means holding said clamp assembly from axial movement,said clamp assembly being adapted to rotate, means for lifting saidclamp assembly, this latter means comprising a pivoted lever, a thirdvertically elongated slot in said post, said lever extending into saidslot and a storage cylinder held by said clamp assembly upon downwardmovement of said lever on the side of the pivot opposite said thirdslot, said pair of slots being so disposed in said post as to permit theclamped cylinder with its axis vertically disposed to rest on a rigidsupport, and means to introduce steam and air separately into thecylinder.

In the drawing, reference numeral 11 identifies a'concrete platformwhich is used as a supporting base for the individual apparatus partswhich make up my cylinder handling apparatus. An inverted frusto-conicaldepression 12 is formed in this concrete platform to act as a sump fromwhich liquids drain into a cylindrical opening 14. Extending through theconcrete platform at this point is an opening provided with a pipe 16 inthe walls of which are openings 14a for drainage of liquid fromcylindrical opening 14 into a drain pipe 17, (Figure 3). If desired, thecylindrical opening 14 is provided with metal lining 15 for protectionpurposes. In order to hold lining 15 rigidly in place anchors 65 areattached thereto and embedded in the concrete, as illustrated in Figure2. The top end of pipe 16 terminates at about being adapted to lift saidslide, said clamp assembly and the same level as does lining 15. A pipe18 also terminates at about this same level for introduction of steamand air into a cylinder, separately as disclosed hereinafter. This pipe18 passes through the walls of pipe 16 and is connected with conduit 48to a manifold 48a, (Figure 1). The bottom portion of pipe 16 connectswith drain 17 which, in turn, is connected with a drain pipe manifold 19which is intended to conduct all drainage liquid to a point of disposal,not shown.

Surrounding the upper edge of the frusto-conical depression 12 in theplatform is an angle iron ring 13. This ring is also attached to anchors65 for holding rigidily in place. This ring 13 is, of course, also forthe purpose of protecting the edges of the concrete against breakage.

A metal post 25 is embedded in the concrete as illustrated in Figure 3for rigid support. If desired, this post is welded to ring 13, or, ifdesired, a section of ring 13 is cut out to accommodate the post. In anyevent, post 25 is held rigidly in place. Within post 25 is an elongatedmovable slide 29 which is illustrated as being closed at both ends. Ifdesired, however, slide 29 can be opened at both ends or opened at thebottom but closed at the top. If this cylinder washing assembly isconstructed out-of-doors, it is preferable to have the upper end of theslide closed, or, it open and the bottom closed, drain holes should beprovided in the bottom closure. A pair of oppositely disposed slots 27are positioned in post 25 as illustrated in Figure 3. A clamp assembly30 is provided at one end with a small diameter shaft or pipe 36 and atits center portion with a larger diameter connecting pipe 34 and at itsother end with the actual clamping portion of the apparatus. Connectorpipe 34 is attached to a circular plate 35 which, in turn, is rigidlyattached to the shaft or pipe 36. A rear clamp member 33 is rigidlyattached to connector pipe 34 as illustrated. This rear clamp member 33is constructed of relatively heavy stock such as the thickness of a 16inch sch. 40 seamless steel pipe. The front clamp member 31 is made ofM3 inch thick steel stock. A hinge 32 connects these clamp members onone side and a toggle type clamp assembly 61 (Figure 4) connects them onthe other side. The shaft or pipe 36, as mentioned, extends throughslots 27 in pipe 25 and through an opening or openings in slide 29 andhas a collar 37 attached to the protruding end by a bolt 38. Pipe 36cannot slip to the right because of collar 37 and it cannot move to theleft because of plate 35. However, the clamp assembly 30, while itcannot move to the right or left in the post, is free to rotate-aboutthe longitudinal axis of the pipe 36 so that when a cylinder is clampedinplace as illustrated in Figure 3, upon raising the clamp assembly andcylinder sufficiently so that the neck 66 is free from pipes 18 and 16,the cylinder can be rotated'and positioned either bottom side down orbottom side up,- as desired. In order to reduce the Weight of theassembly as much as possible, openings 47 are provided in the clampmembers 31 and 33;

In order to raise the clamp assemblyand cylinder I provide a leverassembly which is composed of a pipe 43' pivoted at 40 to angle irons41. These angle irons are also embedded in the concrete platform. Oneend of this pipe or lever extends through a slot 42 in post 25, asillustrated, with: the end- 44 projecting thereinto about-as far asillustrated in Figure 3. The opposite end of'pipe 43 is. provided with ais usedasa foot pedal. and its endof the lever,-

Thus, up'onlowering plate 39' the lever end 44 rises thereby lifting themovable slide 29 andthe clamp assembly 30'. In this elevated position acylinder such as cylinder 67 is raised and can be rotated to any'desiredposition.

As illustrated in the plan view of Figure 1, pipe-43 takes the form asshown in order to make certain that it will clear cylinder 67 at alltimes.

The toggle clamp assembly 61 is illustrated in Figure 4, and itsoperation is as follows: a latch plate 51 is attached to the front clampmember 31 by welds 60. A hinge member 57 is also attached by welding tothe rear clamp member 33. A pair of links 52 are attached to hinge 57 bya bolt 55. These links are free to-rotate at hinge 57. To the oppositeends of links 52 is attached a latch block 54,- by cap screws 56. Thelatch block 54 is also free to rotate. The latch blockis provided with athreaded opening 59 (Figured) for accommodation of a latch screw 53 aportion of which is threaded; Reference numerals 58 identify thethreaded'openings in the ends of the latch block for accommodation ofthe cap screws 56. With the latch block 54 assembled with respect to-thelinks 52the latch screw 53-is threaded into opening 59. The specificoperation of this toggle clamp assembly is best seen in Figure 4; Thelatch screw is unthreaded afew turns and the rounded end 68 of the screwis directed into position adjacent the latch' plate 51 and then thescrew is threaded further through the latch block 54 until the operatorfeels tightening of the s'crew.- The handle end moreuntil the clampde'r;

In reference to Figures 1 and 2 it is noted that the drawingillustratesa three-rack installation. For convenience the three racks areidentified by Rack No. 1, Rack No. 2, and Rack No. 3'. Rack No. 3 hasbeen described'hereinabove relative to details of construction.Racks'numbered 1 and 2 are, in'some cases, constructed exactly like RackNo. 3.- This similarity of construction is carried out in case there arelarge numbers of cylinders ofa given size for cleaning. Racks Nos. 1 and2 areillustrated for use with cylinders smaller than cylinder 67. Forexample, Rack No. 2 is' the same as llack No. 3 with theexception that apair of slots 27a in post a are positioned lower down the post thanslots 27 in post 25. In order that a cylinder will be ap proximatelybalanced when positioned in the clamp assembly it is obvious with asmall cylinder assembly is tight around the cylin will need'bealittle'further down the post than the clamp for a longer cylinder.Likewise-Rack-No.-l is-illustrated in Figure 2 as being constructed foruse with a still smaller cylinder. The diameters-of the: correspondingclamp assemblies tightly drums: having smaller circumferences;

P ping outlay for steam and air is illustrated diagrammatically inFigure l. Pipes 4 8, 49 and 50 lead from a small plate 39 which of thelatch screwis then pushed toward the front clamp member 31, the screwtightened that the clamp assembly for use H a and 30b aremade'correspondmgly smaller inorderto hold manifold, not shown in Figure2, to pipes 18, 18a and 18b, respectively. These pipes 48, 49 and 50lead from the manifold 48a (Figure l) to the individual racks. A pipe 20is provided for conducting steam, from a source not shown, to themanifold while a pipe 21 is provided for passage of air, also from asource not shown, to the manifold. A valve 22 and a valve 23 control thefiow respectively of air and steam in these pipes. Valves 24, 26 and 28are positioned in pipes 50, 49 and 48, respectively. If Rack No. 3 onlyis used, then valve 28 is, of course, opened for admission of eithersteam or air.

In the operation of this cleaning rack assembly a cylinder, such ascylinder 67, is lifted or lowered into place over opening 14, that is,the cylinder is merely set upright in position. The clamp assembly 30,of course, has previously been opened to accommodate the cylinder. Afterpositioning of the cylinder the clamp is closed by operation of thetoggle clamp assembly 61 and when clamp assembly 30 is engaged tightlyaround the cylinder the valve in the top of the cylinder is removed. Theoperator then pushes the foot pedal 39 downward, which operation liftsthe clamp assembly 30 and the cylinder 67. While holding the foot pedal39 down, the cylinder is rotated so that its open end is downward andwhen the opening 66 or neck, as it may he called, is directly over pipe18 the foot pedal is slowly released and the cylinder lowered. When theneck 66 of the cylinder is positioned over pipe 18, a pin assembly 46 isused in order to prevent a cylinder from being blown out of position bythe steam in case steam is inadvertently admitted under high pressure.This pin assembly comprises a pin 63 which is-positioned in an opening62 in post 25. So that the pin will not ever be lost it is attached tothe postby a chain 64, as illustrated in Figure 3. The operator nowmoves to the manifold and opens valve 23 in the steam line and makessure that valve 2.2 in the air line is closed. Valve 28 is also openedto admit steam through pipe 48 to the open end of the cylinder. Steam isadmitted at a desired rate until it is believed that the cylinder isclean from all previous material. At such time valve 23 is closed andvalve 22 is opened and air is admitted through the manifold, valve 28and pipe 48 to dry the cylinder. The cylinder ordinarily dries rapidlybecause it is hot from the steam. When the cylinder is dry, the air isturned off and the pin 63 is withdrawn, foot pedal 39' is againdepressed which operation raises the cylinder and it is rotated degreesand set on its bottom. Either the old or a new valve is inserted in theneck of the cylinder and the thus clean cylinder is then ready to betransported to storage or to a point of intended use.

In case racks numbered 1, 2 and 3 are constructed for cleaning ofcylinders of different sizes, three such cylinders can be cleaned at onetime by opening valves 24, 26 and 28'under which conditions steam isadmitted to all'three cylinders merely by opening the steam valve 23.Steam valve 23 is closed, and valve 22 is opened and the three cylindersare dried simultaneously. Then each cylinder is uprightcd, the valvesinserted and the cylinders are ready for-reuse.

In case only one size of cylinder is to be cleaned in such aninstallation it is obvious that all three racks are constructed exactlythe same, i. e., to accommodate the same size cylinders.

In cases where onlya small numbe'r'of c'ylinder'sarc to be cleaneditm'ay be advisable to install only a single rack as, for example, RackNo. 3. Thus, any number of racks are provided depending upon the numberof cylinders to be cleaned.

While the post and clamp members of the apparatus are ordinarilyconstructed cylinders which have been' used for storage of corrosivematerial it may be advisable to of corrosion resistant materials.purposes ordinary'steelis satisfactory.

of ordinary steel, in case of construct drainpipes However, forordinary" While certain embodiments of the invention have been describedfor illustrative purposes, the invention obviously is not limitedthereto.

I claim:

1. A storage cylinder cleaning rack assembly comprising, in combination,a rigidly supported hollow upright post, a slide movable axially in saidpost, a pair of oppositely disposed slots in said post, the long axes ofsaid slots being disposed axially with respect to said post, an openingthrough said slide normal to the axis of said post, a clamp assembly forholding a storage cylinder, one end of-said clamp assembly extendingthrough said slots and said opening, the longitudinal axis of said oneend being normal to the axis of said post, means holding said clampassembly from movement along the axis of said one end, said clampassembly being adapted to rotate around the axis of said one end, meansfor lifting said clamp assembly, this latter means comprising a pivotedlever, a third vertically elongated slot in said post, said leverextending into said slot and being adapted to lift said slide, saidclamp assembly and a storage cylinder held by said clamp assembly upondownward movement of said lever on theside of the pivot opposite saidthird slot, said pair of slots being so disposed in said post as topermit the clamped cylinder with its axis vertically disposed to rest ona rigid support, and means to introduce steam and air separately intothe cylinder.

2. A storage cylinder cleaning rack assembly comprising, in combination,a vertically disposed, rigidly supported, hollow post, an elongatedslide movable axially in said post, a pair of oppositely disposed slotsin said post, the long axes of said slots being disposed vertically, adiametric opening through said slide, a toggle clamp assembly includinga toggle clamp for tightly holding a storage cylinder, one end of saidclamp assembly extending through said slots and said opening, thelongitudinal axis of said one end being normal to the axis of said post,means holding said clamp assembly from movement along the axis of saidone end, said clamp assembly being adapted to rotate around the axis ofsaid one end, means for lifting said clamp assembly, this latter meanscomprising a pivoted foot lever, a third vertically elongated slot insaid post, one end of said lever extending into said slot and intocontact with said slide and being adapted to lift said slide, said clampassembly and a storage cylinder held by said clamp upon downwardmovement of the end of said lever on the side of said pivot oppositesaid third slot, said pair of slots being so disposed in said post as topermit the clamped cylinder with its axis vertically disposed to rest ona rigid support, means to introduce steam and air separately into saidcylinder, drain means including an inlet for disposal of liquid fromsaid cylinder, an opening in the upper wall of said hollow post, a pinfor insertion into said opening, said pin in said opening being adaptedto hold said slide against upward movement, the center of said clampbeing disposed a sufiicient distance from said post that the center ofsaid clamp is disposed over said inlet to said drain means, and asupport base rigidly supporting said post and said pivoted foot lever.

3. A storage cylinder cleaning rack assembly compris ing, incombination, a vertically disposed, rigidly supported, hollow post, anelongated slide movable axially in said post, a pair of oppositelydisposed slots in said post, the long axes of said slots being disposedvertically, a diametric opening through said slide, a clamp assemblyincluding a clamp for tightly holding a storage cylinder, one end ofsaid clamp assembly extending through said slots and said opening, thelongitudinal axis of said one end being normal to the axis of said post,means holding said clamp assembly from movement along the axis of saidone end, said clamp assembly being adapted to rotate around the axis ofsaid one end, means for lifting said clamp assembly, this latter meanscomprising a pivoted lever, a third vertically elongated slot in saidpost,

one end of said lever extending into said slot and into contact withsaid slide and being adapted to lift said slide and said clamp assemblyupon downward movement of the end of said lever on the side of saidpivot opposite said third slot, drain means including an inlet for disposal of liquid from said cylinder, an opening in the upper wall of saidhollow post, a pin for insertion into said opening, said pin in saidopening being adapted to hold said slide against upward movement, thecenter of said clamp being disposed a sufficient distance from said postthat the center of said clamp is disposed over said inlet to said drainmeans, and a support base rigidly supporting said post and said pivotedlever.

4. A storage cylinder cleaning rack assembly comprising, in combination,a vertically disposed, rigidly supported, hollow post, an elongatedslide movable axially in said post, a pair of oppositely disposed slotsin said post, the long axes of said slots being disposed vertically, adiametric opening through said slide, a toggle clamp assembly fortightly holding a storage cylinder, one end of said clamp assemblyextending through said slots and said opening, the longitudinal axis ofsaid one end being normal to the axis of said post, means holding saidclamp assembly from movement along the axis of said one end, said clampassembly being adapted to rotate around the axis of said one end, meansfor lifting said clamp as sembly, this latter means comprising a pivotedfoot lever, a third vertically elongated slot in said post, one end ofsaid lever extending into said slot and into contact with said slide andbeing adapted to lift said slide, said clamp assembly and a storagecylinder held by said clamp upon downward movement of the end of saidlever on the side of said pivot opposite said third slot, said pair ofslots being so disposed in said post as to permit the clamped cylinderwith its axis vertically disposed to rest on a rigid support, means tointroduce steam and air separately into said cylinder, drain meansincluding an inlet for disposal of liquid from said cylinder, an openingin the upper wall of said hollow post, a pin for insertion into saidopening, said pin in said opening being adapted to hold said slideagainst upward movement, and a support base rigidly supporting said postand said pivoted foot lever.

5. A storage cylinder cleaning rack assembly comprising, in combination,a vertically disposed, rigidly supported, hollow post, an elongatedslide movable axially in said post, a pair of oppositely disposed slotsin said post, the long axes of said slots being disposed vertically, adiametric opening through said slide, a toggle clamp assembly includinga toggle clamp for tightly holding a storage cylinder, one end of saidclamp assembly extending through said slots and said opening, thelongitudinal axis of said one end being normal to the axis of said post,means holding said clamp assembly from movement along the axis of saidone end, said clamp assembly being adapted to rotate around the axis ofsaid one end, means for lifting said clamp assembly, this latter meanscomprising a pivoted foot lever, a third vertically elongated slot insaid post, one end of said lever extending into said slot and intocontact with said slide and being adapted to lift said slide, said clampassembly and a storage cylinder held by said clamp upon downwardmovement of the end of said lever on the side of said pivot oppositesaid third slot, said pair of slots being so disposed in said post as topermit the clamped cylinder with its axis vertically disposed to rest ona rigid support, means to introduce steam and air separately into saidcylinder, drain means including an inlet for disposal of liquid fromsaid cylinder, the center of said clamp being disposed a sufiicientdistance from said post that the center of said clamp disposed over saidinlet to said drain means, and a support base rigidly supporting saidpost and said pivoted foot lever.

6. A storage cylinder cleaning rack assembly comprising, in combination,a vertically disposed, rigidly supported, hollow post,- an elongatedslide movable axially in said post,- a pair. of oppositely disposedslots in said post, the long axes of said slots being disposedvertically, a'diametric opening through said slide, a clamp assembly fortightly holding a storage cylinder, one end of said clamp assemblyextending through said slots and said opening,the-longitudinal axis ofsaid one end being nor mal to the axis of said post, means holding saidclamp assembly from movement along the axis of said one end, said clampassembly being adapted to rotate around the axis of said one end, meansfor lifting said clamp assembly, this latter means comprisinga pivotedlever, a thirdvertically elongated slot in said post, one end of saidlever extending into said Slot and into contact with said slide andbeing adapted to lift said slide and said clamp assembly upon downwardmovement of the end of said lever on the side of said pivot oppositesaid third slot, said pair of slots being so disposed in said post as topermit the clamped cylinder with its axis vertically disposed to rest ona rigid support, means to introduce steam and air separately into saidcylinder, drain means including an inlet for disposal of liquid fromsaid cylinder, an opening in the upper wall of said hollow post, a pinfor insertion into said opening, said pin in said opening being adaptedto hold said slide against upward movement, and a support base rigidlysupporting said post and said piv oted lever.

7. A storage cylinder cleaning rack assembly comprising, in combination,a vertically disposed, rigidly supported, hollow post, an elongatedslide movable axially in said post, a pair of oppositely disposed slotsin said post, the long axes of said slots being disposed vertically, adiametric opening through said slide, a toggle clamp assembly fortightly holding a storage cylinder, one end of said clamp assemblyextending through said slots and said opening, means holding said clampassembly from axial movement, said clamp assembly being adapted torotate around the axis of said one end, means for lifting said clampassembly, this latter means comprising a pivoted foot lever, a thirdvertically elongated slot in said post, one end of said lever extendinginto said slot and into contact with said slide and being adapted tolift said slide, said clamp assembly and a storage cylinder held by saidclamp upon downward movement of the end of said lever on the side ofsaid pivot opposite said third slot, said pair of slots being sodisposed in said post as to permit the clamped cylinder with its axisvertically disposed to rest on a rigid support, means to introduce steamand air separately into said cylinder, drain means including an inletfor disposal of liquid from said cylinder, and a support base rigidlysupporting said post and said pivoted foot lever.

8. A storage cylinder cleaning rack assembly comprising, in combination,a vertically disposed, rigidly supported, hollow post, an elongatedslide movable axially in said post, a pair of oppositely disposed slotsin said post, the long axes of said slots being disposed vertically, adiametric opening through said slide, a clamp assembly for tightlyholding a storage cylinder, one end of said clamp assembly extendingthrough said slots and said opening, means holding said clamp assemblyfrom axial movement, said clamp assembly being adapted to rotate aroundthe axis of said one end, means for lifting said clamp assembly, thislatter means comprising a pivoted lever, a third vertically elongatedslot in said post, one end of said lever extending into said slot andintocontact with said slide and being adapted to lift said slide andsaid clamp assembly upon downward movement of the end of said lever onthe side of said pivot opposite said third slot, said pair of slotsbeing so disposed in said post as to permit the clamped cylinder withits axis vertically disposed to rest on a rigid support, means tointroduce steam and air separately into said cylinder, drain meansincluding an inlet for disposal of liquid from said cylinder, and asupport base rigidly supporting said post and said pivoted lever.

9. A storage cylinder cleaning rack assembly comprising, in combination,a vertically disposed, rigidly supported, hollow post, an elongatedslide movable axially in said post, a pair of oppositely disposed slotsin said post, the long axes of said slots being disposed vertically, adiametric opening through said slide, aclamp assembly including a clampfor tightly holding a storage cylinder, one end of said clamp assemblyextending through said slots and said opening, means holding said clampassembly from axial movement, said clamp assembly being adapted torotate around the axis of said one end, means for lifting said clampassembly, this latter means comprising a pivoted lever, a thirdvertically elongated slot in said post, one end of said lever extendinginto said slot and into contact with said slide and being adapted tolift said slide and said clamp assembly upon downward movement of theend of said lever on the side of said pivot opposite said third slot,drain means including an inlet for disposal of liquid from saidcylinder, the center of said clamp being disposed a sufdcient distancefrom said post that the center of said clamp is disposed over said inlettosaid drain means, and a support base rigidly supporting said post andsaid pivoted lever.

10. A storage cylinder cleaning rack assembly comprising, incombination, a rigidly supported hollow upright post, a slide movableaxially in said post, a pair of oppositely disposed slots in said post,the long axes of said slots being disposed axially with respect to saidpost, an opening through said slide normal to the axis of said post, aclamp assembly for holding a storage cylinder, one end of said clampassembly extending through saidslots and said opening, the longitudinalaxis of said one end being normal to the axis of said post, meansholding said clamp assembly from movement along the axis of said oneend, said clamp assembly being adapted to rotate around the axis of saidone end, means for lifting said clamp assembly, this latter meanscomprising a pivoted lever, and a third vertically elongated slot insaid post, said lever extending into said slot and being adapted to liftsaid slide and said clamp assembly upon downward movement of said leveron the side of the pivot opposite said third slot.

References Cited in the file of this patent UNITED STATES PATENTS1,280,731 Herr Oct. 8, 1918 1,322,439 Herr Nov. 18, 1919 1,475,536Bonine et al. Nov. 27, 1923 UNITED STATES PATENT OFFICE CERTIFICATE OFCORRECTION Patent No. 2,878,507 March 24, 1959 Wesley B. Rynders It ishereby certified that error appears in the -printed specification of theabove numbered patent requiring correction and that the said LettersPatent should read as corrected below.

Column 2, line 35, for "rigidily" read rigidly column 6, line 72, after"clamp' insert is column '7', line 37, claim '7, line 62, claim 8; andcolumn 8, line 23, claim 9, before "means", each "occurrence, insert thelongitudinal axis of said one end being normal to the axis of said post,column "7, line 38, claim '7; line 63, claim 8; and column 8, line 24,claim 9, after "movement", each occurrence, insert along the axis ofsaid one end column '7, line 38, claim '7; line 62, claim 8; and column8, line 24, claim 9, strike out "axial", each occurrence,

Signed and sealed this 22nd da; of December 1959.,

SEAL) ttest: KARL H. AXLINE ROBERT C. WATSON Attesting OfficerCommissioner of Patents

